Phase 1 (1st year) procedures. After the dyads sign on the consented forms, Investigator spend about 3 hours to collect demographic data, test battery and teach the dyads how to move of patient's medication into the EMS box which contains a sensor to record when the container is opened. Investigator tell the dyads that the box can help patients count their medication pills and it must be used in each medication-taking event. Investigator also teach FCGs how to fill out a medication diary with their observation of patients' medication taking behavior. For those who have their own medication organizers, Investigator ask them to move one of their medications into the system for consistent measure. The baseline observation of medication adherence will last 4 weeks to screen out those who do not have adherence problems which are defined as adherence is less than or equal to 90% of the inter-dose interval over this 4-week medication monitoring period. The rationale for this inclusion criterion is that other studies found that using the EMS introduces some novelty that can initially boost adherence. Since the EMS is new to the participants who may experience this novelty, Investigator will adopt this stringent criterion comparing with the general definition of medication adherence >= 80% the inter-dose interval. At the end of 4 weeks, the trained part-time student assistant will down load the medication adherence data and remove the system from the dyad's house. If the PWCIs have multiple medications, Investigator will select only one (prioritizing order: dementia treatment, antipsychotic medicine, antihypertensive medicine). All the participant dyads will take turns to use the EMS system. During the first 6 months of the first year, Investigator will develop the teaching material and a protocol for phase I pilot study.